Furnace-grate.



"'YQBATENTED JAN; 8,1907.

, O. J. DORRANGE.

FURNACE GRATE. 1 APPLIOA'TION FILED JAN.18,1905.

3 SHEETS-SHEET '2.

/Ia'r es'JD f; H

00., WASHINGTON, n c,

PATENTED JAN. 8, 1907. 0. J. DORRANUE. FURNACE GRATE. APPLICATION FILED JAN-18.1905. I

a sums-sum 3.

.EEi-W Quad??? ESEEM ImW CHARLES J. DORRANCE, OF CHICAGOFILLINOIS.

FURNACE-GRATE.

Specification of Letters Patent.

Patented Jan. 8,1907

Application filed January 18,1905. Serial No. 241,568,

To all whom lit may concern:

' Be it known that I, CHARLES J. DORRANOE,

a citizen of the United States, and a resident of the city of Chicago, in the'county-of Cook and State of Illinois, have invented certain new and useful Improvements in Furnace- Grates; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

- This invention relates more particularly to a shaking-or rocking furnace-grate of the class set forth in my priorpatents for Rockingor shaking grate-bar, issued to me May 14, 1889, No. 403,255, and Movablegratebar, issued May 5, 1891, No. 451,615. grates of this class as heretofore constructed the lever-arms on the grate-bars have been arranged at one side of the center of oscillation of the bar, and therefore have a tendency to lift the bar from its bearing, thus dumping a part of thefire into the ash-pit and causing great inconvenience and trouble, frequently necessitating drawing the fire. Furthermore, the fuel varies in character and fineness, and frequently the fuel for which the grate is particularly adapted is not so readily obtainable as a finer or a coarser grade, which may require for combustion a greater or less air-supply than the grate is constructed to afford. It is also of course important to so construct the grates as to prevent the air-spaces betweenthe parts thereof becoming-clog ed by the accumulation of cinders or clin ers, which would otherwise shut off a portion of the draft and seriously effect the operation of the furnace.

With these considerations in view the object of my invention isto afford a shaking or rocking grate construction in which the air or draft spaces between the parts of the grate are capable of variation without the necessity of removing the grate-bars and to afford a grate construction providing a fuel-surface comprising individual units so constructed and combined in relation with each other as to afiord uniform draft-spaces between the units.

It is also an object of my invention to so construct and support the grate-bars as to positivelysecure the same from'lifting from only the oscillating or rocking movement characteristic of this construction.

It is a further object of my invention to afford a construction adapted to difierent widths of furnaces without necessitating the use of a longer grate-bar, but notwithstanding extending the grates close to the side walls.

Lastly, it is an important object of this invention to afford a grate construction in which the operation of the grate acts to clean the side and end walls of the furnace of clinkers and to prevent the accumulation of the same upon said walls of the furnace The invention embraces many novel features; and it consists in the matters hereinafter described, and morefully pointed out and defined in the appended claims.

In the drawings,-Figure 1 is a fragmentary horizontal section of a furnace provided with a grate construction embodied in myinvention, and in which a part of the fuel-surface has been removed. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is an enlarged fragmentary detail illustrating the operation of the grate. Fig. 4 is an enlarged perspective view of one of themiddle gratears embodying my invention. Fig. 5 is an enlarged fragmentary side elevation of the same,partly in section, illustrating the means of holding the grate-bar from lifting. Fig. 6 is a perspective view of one of the straddleclips adapted to be carried on the end of the grate-bar over the bearing and projecting beyond the frame. Fig. 7 is a fragmentary perspective view showing a part of the grate-bar with some of the single clips removed. Fig.

8 is a vertical transverse section of one of the single clips. Fig. 9 is a fragmentary section of the apertured stationary front grate-bar. Fig. 10 is a perspective view of a straddle-clip embodied in my invention. Fig. 11 is an enlarged fragmentary view, partly insection, showin said clip in place. Fig. 12 is'an enlarged fragmentary side elevation of one of the side rails or bars.

As shown in the drawings, the grate is sup ported upon a frame of any suitable construction comprisingside rails or bars 'A'A, which may be supported in the masonry of the arch, if preferred, or upon metallic or other legs A, one of which is shown in Fig. 2 and which rests upon the floor or bottom of the ashpit.

their bearings when operated and to permit 1 Extending across and affording a support and rigidly connecting the front ends of said side barsA is an end frame member or bar a. Supported upon the frame thus formed is a stationary front grate bar A which, as shown in Fig. 1, is of a'length toextend into close proximity with the side walls and is provided on its front and rear sides with narrow slots therein, affording an air-inlet or draft-space theretl ough. Resting on a ledge a inner side the fire-front is a dead-plate a, which. is.- of a suflicient width to fill. the space between said fire-front and the front side of the stationary grate-bar A asshown in Figs. 1. andi2, thus affording a plane surface at the front. end of the furnace over which-the fuelris delivered to.- thev grates. Said side frame members are provided. at intervals,. and. at

equal distances apart, with bearings upon.

which. the grate-bars are journaled As shown, said bearings compriseupwardly-di rected bosses (L2,, eachhaving a concave bearing-seat. in. the-top thereof andeach provided on. the inner side of the side frame member with an inwardly-directed: lip (L as shown inv Fig. 5,. thus affording an, surface Efachoi the-grrte-barsB toB inclusive, consists, asshown, of a. cast or other bar of metal approximately rectangular in crosssectionandrplain. for its entire length, excepting; at itsends, and, asshown, of greater vertilcali widthat its middle part than at its end portions. Asshownalso, each of said gratears at its; ends is provided with a cylindric j0urnal1b,.which.is parallel with the bar, but in. advance thereof and integrally connected therewith by an angle-plate 6 as shown in Figs..1-, 3,. and 4 On the outer end of. said cylindricjournalis provided a plate b.,paral lelrwith. the angle-plate b andwhich extends elongated, bearingrearwardly into alinernent withv the rear side of. the bar. and is provided onitsoutward side in. alinement with. the bar with a rib b havinga. groove or seat at each side and; at the top, thereof, as shown in Fig, 4.. A corre-- spending groove or seat isprovided in. a fillet b'" on the bar. adjacent the-angle-plate 5 A proj ectinglipb,.integral with the angle-platebig, extends beneath said: journal I) and. is adapted; t'ofit closely to the lipa on the side frame,, asshownin- Fig. 5, and prevents the bar from beingliftedfrom its bearings when operated.

Secured:v oneach grate-bar and extending downwardly and.

more integral, rockerarms indicated on: the

bar B; by b and- 53, of which the rocker or a shaking arm 12 islocated near the-middle of the bar Bi and same,,and,.as.shown, the barsrB B and. B

ment therewith. and connected by means-of. a

'alined rocker-arms c J bars B, B, B or shoulder 0 suitable height on the forwardly therefrom. to points directly below the bearings are one orthe arm I) near. one end theconnecting-bar l)". A lever C is pivoted at its center on the leg or bracket A and extends vertically, and a connecting-bar 0 connects the arm I) with the upper end of the same. A bar 0 connects the lower end of said lever with a rocker-arin c on the gratebar B, and a connecting-bar C connects 011 the alternate grateand B intermediate the grate-bars connected by the bar I)". As shown, a shaker-bar D is pivotally engaged on the rocker shaker-arm b on the grate-bar B and extends. forwardly through the firefront of theboiler and: is pivotally connected at its outer end to a lever d, the lowerend of' which. is pivoted upon a bracket (1, carried upon the fire-front, and. the upper end of which is adapted for engagement with the shaking lever As shown also, a clip orbracket 0 isrigidly secured on the bracket or leg A. and extends upwardly and engages theinner end of the pivot-pin. c of the lever G, the other end of which is engaged in said bracket or, leg A., Removably secured on each of said grate-bars are duplicate clips, some of which are single clips, as indicated by F, and someof which afford a grate-surface equivalent of aplurality. of the single clips. These latter (indicated by E) aretermedstraddleclips, and, as shown, are cast or otherwise constructed to. afiord a.- com vexfire-surface at the top,.and. comprise a. centralweb provided at its extremitieswitli integral downwardly-extending ends or legs a, each of which is provided with a central verticalslot therein open at the bottoinandhaw ing the inner faces thereof; shaped complementally with the groove or seatsin the rib and fillet b on. the grate-bar and adapted to-engage therein, as shown in, Fig. 1,, covering the bearing. Each 015 said. straddle-clips is provided on each side of the central. webwithlaterall -directedproj ections c, as shown in Fig. 6, w llCll' taper outwardly and downwardly, thereby preventing material. from: becominglodgedj therein.v

The singleclips, as shown, each coinprisea casting of. metalv shaped to. correspond withthe endportions or legs of the straddle-clipsand tapering. from thetop downwardly and also tapering from the center. laterally to the endsof the clip, as shown i11-Elg S..7 and 8\ Each of said clips is provided. on. one or botlr sides. of the same adjacent the slot therein with a ribor projection which strengthens the-same and aifords means for spacing the single clips a; uniform. distance apart upoir the-grate-bar.

The operation is as follows: A. furnace at any kind: orconstruction and. for any fuel; may be provided with grates embodying my invention, and thesamemay be constructed. of a- Width necessitating a single length of grate-bar or two or-more-grate-bars arranged end to end, as preferred, and it is obvious ames where a;g pluralitymf-i suehggrate harssare aarranged en vtor'e d the straddle elipston their' the grate-bar is swung to a vertical {position orvtoany position theggratehan is capable of asslilmingtdi1ring1 normal operation saidv ilip's or projeetionsjf;prevent the t bari: lifting wo'wirigv to their tmutual engagement. The vlarious v .connectingEbars-nand the wshakin'ghar eare 40 a v to be xvaried at will-toaaceommodat'ewtheturmaceezto di'fierent grades :ofi fuel, inasmu h :now seeured :in place Pi'VOtHJllY GOD nesting thee grate ba-rs so i that alternate grate -bfiirs -1 m ted Spy the-:same connectin-g gbars, and owing to the arranglement of t'he l-eve r C-w-and its connectiomwit ltheagrate-bars adat one endfiif theigrateebarearemowweeured in p'laee covering *the bearings as shown :in

loosely xin p shown'in: egg. 1=tance= apartbyrmeansof a; r

orrreach. illnas'muchda th ace upon "each agrate-bar, r as f T roj-ection singlebli m downwardly-5andtlaterally iit ais obvious that cinders, clinkers, or other material 1 that might ()t-he1'wise clog theyfire 'having once wpassed 'below the I t'op of the -clip :wmust tall freely therefrom in-to theiash+pitg thus insuruniformtdraft ispaceaat an times. 'lhis construction also renabl es lithe zgnate surface 1 the" straddle elipstaridaalli thesingle clipsware gquiokly removable, thusipermitting:others to be :substituted t'herfor. The r-substi-tuted *s-trdddleeelips are constructed as beiorerdescribed, but afford a greater orless-finurnber -rot dateralaprojections" a ,;:providing al=ess'-or a greater :air space, as lkiesire'd. The 1 thickness of the single clips of course will he varied to correspond with the straddle-clips,v

an'd the thickness of the "ribs or projections f correspond with the thicknessot the 'clip. With each installation"eljpssadaptable for difierent classes #ofr tuel rma'y be furnished, and owing to the simplicity of the construction one set of cli s may be removed and another substituted thus adapting the grates for any kind of'fuel.

By use of the straddle-Clips shown in Figs.

10 and 11 a grate of a standard size can be used in a furnace considerably wider than would otherwise be possible, inasmuch as said clips are constructed as before described with the addition of a lip or projection e on .frem each other, ias shown F1:

'lowers tha-rgratej-fba g dul ating mov-ement in the r m-mace 7, andv spaeed the desirdQdisp oiose relation to the hbnidg 'wa &

the outer endmfi. therel'ip y iexterrdilrg zthe ifiressurfaee longitudinally beyienflitheten (tithe bw-into close relation witlnthe fiumace "wall.

engaged with' the sameccenneetimg rodsnand said 'ibars ":being rpivotally fisupported npon b'ear/ingsfirecoentrimtherewith-mid in advariee of: the-Lgrate-bar, in s'hakin'g their" n-eent 'sigrateebar imove opposite'l t r causes the fuel to travel towardzthe-reaieend i-of the fiurnace andrifl eetually islices thedire. bv-i ously also, ina'smueh sass J the stra d'ti te- 'cl ips -roperatein' elose ion withithe sside w al'lst of the r'furnaee ea d the straddle wand -:-single clip on it the wear rggrat ar swing i n f irthe ffurnace,' "the operation oftt' v serves to' removevo'r on all 1 I @adheringvto saidsv-all 'therefrom, leav ing t wallsz'clean. p

sgnate-bar lendsktheiconstructions reaklily to' -a wide variation in the fire-surface and the draft *iaiff orde'rl l t'hereth rough, sand though I t have shown a rpartieular dorm bawand *clipse-mbdd-E l Iinvention Ed motspnn vese limiting this anventron ethewise than i358 nec'es sit ated: by. the prion-art ias obwiou'isly manymletatls ot Iconstnuetion -and operation a "may be varied 'withoutfldeparting fremi the 'principles of rny invention.

I elaim as1myinvention- .11. Ine a; grate the'eembinatiomwithtbearing-"bars ==of TOCkilZIg whats vrlmount-eki thereon, seachrro&k ing -bar beingaeprovide ith :ctgrooves: arranged won opposite-1* side's Jthe bearin fi -bars and formingseats, arrdnproteeting an fuel supporting: elipsrstraddling said hearing-bars and engagiing'sard seats.

2. In a grate the combination with bearing-bars of rocking bars pivotally engaged thereon and each provided with grooves on each side of the bearing-bars, a plurality of single clips engaged on the rocking bars intermediate the bearing-bars, a straddle-clip extending overeach bearing and engaged in said grooves and means preventing sai rocking bars lifting from their bearings when rocking.

who

3. In a grate the-combination with bearing-bars of transverse rocking bars having offset journals on each .end thereof engaged on said bearing-bars and provided with a groove on each side of the journal, clips seated on said rocking bars intermediate the ends thereof and a straddle-clip'seated in the grooves adjacent each journal and covering the same and extending beyond the bearingbar into close proximity with the furnacewall affording an extended fuel-supporting surface.

4. In a grate the combination with bearing-bars of grate-bars j ournaled thereon at equal distances apart and provided with a groove at each sideof each bearing-bar, a straddle-clip extending over each bearingbar and provided with downwardly-directed legsadapt'ed to engage 'in said grooves, independently-removable clips engaged on the bar between the straddle-clips and together therewithcaffording a fire-surface and a projection on each end of the grate-bar extending beneath the-bearing and acting to hold the grate-bar from lifting when operated.

5. The combination in a furnace-grate, of rigidly-supported side frame members, parallel grate-bars journaled eccentrically thereon at their ends and provided with seats at each from its bearings side of the bearing-bars, straddle-clips engaged in said seats and straddling said-bearing-bars, interchangeable duplicate clips carried on and projecting above the bars and affording a fire-surface, means for shaking the grate and a projection 011 each end of each grate-bar extending beneath the bearingand holding the bar from lifting when shaken.

6. In a furnace-grate the combination with rigidly-supported side frame members havingbearings therein of grate-bars spaced at equal distances apart and having offset jourengage in said nals at their ends adaptedto bearings, and provided withgro'oves on each side of the journal interlocking means acting to prevent the grate-bars lifting from their bearings when operated, bars connecting alternate gratebars in sets, means connecting said sets and adapting them'to move oppositely, 'a shaking-bar connected with one of said grate-bars and acting to swing adjacent bars oppositely inshaking the grate, straddle-clips having a slotted leg 'on each end adapted to engage the grooves in the gratebars and single clips affording together with the straddle-clips a fire-surface removably secured on and projecting above said bars.

7'. A grate-bar comprising a plain bar hav ing forwardly-directed plates or knuckles at each end of the same and cylindric journals secured on said plates parallel with the bar, a plate engaged on the outer end of each journal, a straddle-ch covering the journal and projecting beyon the ends of the same, a lip or projection on one of said plates adapted to engage beneath the support for said bar and acting to prevent the bar lifting when shaking the'grate.

8. In a grate construction the combination with a frame of parallel grate-bars having journals therein engaged in bearings in said frame, single clips on the bars intermediate the ournals, straddle-clips removably engaged on the ends of the bars and covering the journals and provided with a lip projecting beyond the end of the bar and into close relation with the furnace-wall.

9. In a grate construction the combination with side supporting members of gratebars journaled on and projecting beyond the same an offset journal on each end of the bar and a groove on each side of each journal, straddle-clips covering the journals and enga 'ed at their ends in said grooves, and provi ed with a projection 011 the outer end of each adapted to extend the clip close to the furnace-wall and intermediate clips supplorted on the bar between the straddlec 1 s.

1 0. In a device of the class described the combination with a grate-bar having oflset journals at the 'ends thereof and having a groove on each side of the journal, a plurality of clips supported on the bar between the journals, a straddle-clip covering each journal and comprising a central web and having lateral projections extending into close proximity with the furnace-walls and a legon each end of said clip adapted to engage in the grooves on theopposite side of the ournal.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

CHARLES J. DORRANGE. 

